Configuring DNS on multiple vap-groups.

When the XOS CLI command configure dns server is used to assign a DNS server to be used by VAP groups on the system, the VAP group must be specified in the command.

Note: The XOS Command Reference Guide states that if the vap-group parameter is not specified when configuring DNS, the setting will apply to all VAP groups in the chassis. This is incorrect; leaving out the vap-group parameter assigns a DNS server that can be used by the CPM, but the DNS server is not assigned to VAP groups. This information will be corrected in future releases.

Cause:

Failure to add the vap-group parameter to the configuration command line will result in DNS not working for the VAP group. If the specific VAP group is not named, the /etc/resolv.conf files are not updated on the APMs in the VAP group, resulting in the DNS lookups failing.

Resolution:

In order to configure a VAP group to use a specific DNS server, the VAP group has to be named within the CLI command. For example:

CBS# configure dns server 4.2.2.2 vap-group fw

You can verify that the DNS server has been added to the configuration by running the show dns-server CLI command, or by reviewing the /etc/resolv.conf file on each VAP group member.